SAML21: Add missing support for GCLK8

arch/arm/src/samdl/sam_serial.c

@@ -977,9 +977,9 @@ void up_earlyserialinit(void)
   sam_disableallints(TTYS5_DEV.priv);
 #endif
 
+#ifdef HAVE_SERIAL_CONSOLE
   /* Mark the serial console (if any) */
 
-#ifdef HAVE_SERIAL_CONSOLE
   CONSOLE_DEV.isconsole = true;
 #endif
 }

arch/arm/src/samdl/saml_clockconfig.c

@@ -277,6 +277,23 @@ static const struct sam_gclkconfig_s g_gclkconfig[] =
     .clksrc     = (uint8_t)(BOARD_GCLK7_CLOCK_SOURCE >> GCLK_GENCTRL_SRC_SHIFT),
   }
 #endif
+
+  /* GCLK generator 8 */
+
+#ifdef BOARD_GCLK8_ENABLE
+  ,
+  {
+    .gclk       = 8,
+#ifdef BOARD_GCLK8_RUN_IN_STANDBY
+    .runstandby = true;
+#endif
+#ifdef BOARD_GCLK8_OUTPUT_ENABLE
+    .output     = true;
+#endif
+    .prescaler  = BOARD_GCLK8_PRESCALER,
+    .clksrc     = (uint8_t)(BOARD_GCLK8_CLOCK_SOURCE >> GCLK_GENCTRL_SRC_SHIFT),
+  }
+#endif
 };
 
 #define NGCLKS_ENABLED (sizeof(g_gclkconfig) / sizeof(struct sam_gclkconfig_s))